Heat sealable thermo-printable tape

ABSTRACT

In an embodiment, a heat-sealable thermoprintable tape includes an extruded thermoplastic coating having a smooth printable surface on a first side, and an extruded heat-seal polymer layer disposed on a second side of the extruded thermoplastic coating, opposite the first side. The extruded thermoplastic coating is bonded to the heat-seal polymer layer to form the heat-sealable thermoprintable tape. In another embodiment, a method of forming a heat-sealable thermoprintable tape includes providing a support layer having an open structure configured to support an extruded coating, applying a polyurethane coating onto a first side of the support layer and into open spaces of the open structure to form a top surface, and extruding a heat-sealable polymer onto a second side of the support layer opposite the first side and into the open spaces of the open structure. The polyurethane coating bonds to the heat-sealable polymer within the open structure of the support layer.

TECHNICAL FIELD

The present disclosure relates to an extrudable tape, and moreparticularly, an extrudable tape with a smooth printing surface.

BACKGROUND

Thermoprintable tapes are used for labeling and tagging industrialgarments, uniforms, hunting gear, shoes and boots, and otherapplications. Thermoprintable tapes are typically in the form of aflexible ribbon, and can have identifiers printed on for application toindividual garments. Conventional thermoprintable tapes are preparedusing a tight weave or high-count fabric, such as a woven nylon orpolyester fabric, which is heat set and pre-calendared close to theweave for induction on a coating line. The tight weave (e.g., 90×64) orhigh-count fabrics may be polyesters of various weights (e.g., 1.2oz/yd² to 2 oz/yd²). A base coating, such as a two-component systemincluding an aromatic urethane in a solution such as toluene or methylethyl ketone, is applied to the woven fabric, and smoothed by a floatingknife or a knife over roll. The base coating is conventionally a solventbased thermoplastic polyurethane (TPU) polymer, aromatic in nature,compounded with pigments, cross-linkers, or both, which is film formingon a tightly knit fabric when the solvent is evaporated. The basecoating is then dried and cured, evaporating the solvents and forming asolid film on the woven fabric substrate which does not fall through thetight knit fabric, but may include the contours of the weave on thesurface. A top coating is then applied to the base coating. The topcoating is also conventionally solvent-based and aliphatic in nature toprotect against yellowing, and may require further mechanical treatmentto smooth the surface. After the base coat and top coat have beenapplied, conventional thermoprintable tapes require application of aheat seal coating to the back of the tape. The tape with the heat sealcoating is then post-calendared to smooth the surface of the tape.

In conventional tapes, the thermoprintable tape with a woven nylon orpolyester fabric may have a propensity to curl after washing, and, inthe case of nylons, may not adhere to polyester fabric and may besusceptible to moisture. Furthermore, in conventional methods, the filmformed by the base coating may be susceptible to heat, requiringrequires cross-linkers (e.g., triisocyanate), which may not besolvent-resistant, to become heat resistant, thus making washing anddrying difficult.

Additionally, conventional thermoprintable tapes typically may have asurface that follows the contours of the weave of the woven fabric afterthe solvents are evaporated, thus resulting in difficulty achieving highresolution thermoprinting without additional or special processing tomake the surface smoother. When the surface includes the contours of theweave, the printed matter may be discontinuous, e.g. a printed bar codemay be unreadable, and smaller prints may be overwhelmed by theirregularity of the surface texture. The printing surface follows thepattern of the woven fabric even with multiple layers of base coatingsor top coating are applied, as the woven fabric will still have acontour pattern in each subsequent layer, and the layers contribute tothe defects in the printing surface. Additives such as expanding solidsand dispersible solids are conventionally used to improve surface areafor printing, but the surface may still need calendaring for a smoothprinting surface, as well as further processing by solvents to removethe solids. Furthermore, multiple calendaring may be used on multiplecoated layers, but a smooth surface is difficult to achieve withoutpre-calendaring and post-calendaring the layers, and may increaseproduct processing time.

SUMMARY

According to at least one embodiment, a heat-sealable thermoprintabletape includes an extruded thermoplastic coating having a smoothprintable surface on a first side, and an extruded heat-seal polymerlayer disposed on a second side of the extruded thermoplastic coating,opposite the first side. The extruded thermoplastic coating is bonded tothe heat-seal polymer layer to form the heat-sealable thermoprintabletape.

According to one or more embodiments, the smooth printable surface mayhave a surface roughness of at most 50 μin as measured by aprofilometer. In at least one embodiment, the smooth printable surfacemay have a surface roughness of 10 to 40 μin as measured by aprofilometer. According to at least one embodiment, the extrudedthermoplastic coating may have a Shore Hardness of 45 to 98 A. In anembodiment, the heat-sealable thermoprintable tape may further include asupport layer between the extruded thermoplastic coating and theextruded heat-seal polymer layer, the support layer having an openstructure, wherein the extruded thermoplastic coating and heat-sealpolymer may be bonded within the open structure of the support layer. Inone or more embodiments, the support layer may be a scrim, a permeablesheet, a spun fabric, or a woven layer. Further, the scrim may be ascrim having a thread count of 150 to 200. In an embodiment, the scrimmay be a polyester scrim. In one or more embodiments, the extrudedthermoplastic coating may be 1 to 5 mm thick, and the heat-seal polymerlayer may be 1 to 5 mm thick. According to one or more embodiments, theextruded thermoplastic coating may be a thermoplastic polyurethanecoating. In certain embodiments, the extruded thermoplastic coating andthe extruded heat-seal polymer may be the same polyurethane material. Insome embodiments, the heat-sealable thermoprintable tape may furtherinclude an aliphatic polycarbonate polyurethane top coat layer disposedon the first side of the extruded thermoplastic coating.

According to at least one embodiment, a method of forming aheat-sealable thermoprintable tape includes providing a support layerhaving an open structure configured to support an extruded coating,applying a polyurethane coating onto a first side of the support layerand into open spaces of the open structure to form a top surface, andextruding a heat-sealable polymer onto a second side of the supportlayer opposite the first side and into the open spaces of the openstructure. The polyurethane coating bonds to the heat-sealable polymerwithin the open structure of the support layer.

According to one or more embodiments, the top surface may have a surfaceroughness of at most 50 μin as measured by a profilometer. In anembodiment, applying the polyurethane coating may include reverse-rollprinting the polyurethane coating. In one or more embodiments, the openstructure of the support layer may be defined by a void content of 10 to50% by volume. In one or more embodiments, the method may furtherinclude applying an aliphatic polycarbonate coating to the top surfaceof the polyurethane coating by reverse-rolling to form a printablesurface.

According to at least one embodiment, a method of forming aheat-sealable thermoprintable tape includes applying a heat-sealablepolymer to a support layer to form a first composite, applying analiphatic polycarbonate polyurethane coating to a releasable paper,applying a polyurethane coating on to the aliphatic polycarbonatepolyurethane coating on the releasable paper to form a second composite;and bonding the heat-sealable polymer of the first composite to thepolyurethane coating of the second composite within the support layerwith heat and pressure to form the heat-sealable thermoprintable tapehaving a printable surface on the aliphatic polycarbonate polyurethanecoating.

According to one or more embodiments, applying the aliphaticpolycarbonate polyurethane coating to the releasable paper may includereverse-roll printing. In certain embodiments, applying a heat-sealablepolymer may include reverse-roll printing the heat-sealable polymer toform the first composite, and applying the polyurethane coating to thealiphatic polycarbonate polyurethane coating may include reverse-rollprinting to form the second composite. In one or more embodiments, theprintable surface may have a surface roughness of at most 50 μin. In anembodiment, the support layer may have an open structure defined by avoid content of 10 to 50% by volume.

According to at least one embodiment, a heat-sealable thermoprintabletape includes a support layer having an open structure configured tosupport an extruded coating, an extruded thermoplastic coating disposedon a first side of the support layer and in the open structure, theextruded thermoplastic coating having a smooth printable surface, and anextruded heat-seal polymer layer disposed on a second side of thesupport layer, opposite the first side, and in the open structure. Theextruded thermoplastic coating is bonded to the heat-seal polymer layerwithin the open structure of the support layer to form the heat-sealablethermoprintable tape. In one or more embodiments, the open structure ofthe support layer may be defined by a void content of 10 to 50% byvolume. In certain embodiments, the extruded thermoplastic coating andthe extruded heat-seal polymer are the same polyurethane material.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1A is a schematic illustration of a thermoprintable tape as a labelon a uniform, according to an exemplary embodiment;

FIGS. 1B-1C are schematic illustrations of the labels of FIG. 1A,according to an exemplary embodiment;

FIG. 2A is a schematic illustration of a cross-section of athermoprintable tape, according to an embodiment;

FIG. 2B is a schematic illustration of a cross-section of athermoprintable tape, according to another embodiment;

FIG. 3 is a flow chart of an extrusion process for forming athermoprintable tape, according to an embodiment;

FIG. 4 is flow chart of an extrusion process for forming athermoprintable tape, according to another embodiment;

FIG. 5A shows a schematic process diagram for forming a thermoprintabletape, according to yet another embodiment;

FIG. 5B shows a schematic illustration of a cross-section of a startingcomponent of the process of FIG. 5A; and

FIG. 5C shows a schematic illustration of a cross-section of anotherstarting component of the process of FIG. 5A.

DETAILED DESCRIPTION

As required, detailed embodiments of the present invention are disclosedherein; however, it is to be understood that the disclosed embodimentsare merely exemplary of the invention that may be embodied in variousand alternative forms. The figures are not necessarily to scale; somefeatures may be exaggerated or minimized to show details of particularcomponents. Therefore, specific structural and functional detailsdisclosed herein are not to be interpreted as limiting, but merely as arepresentative basis for teaching one skilled in the art to variouslyemploy the present invention.

Moreover, except where otherwise expressly indicated, all numericalquantities and ranges in this disclosure are to be understood asmodified by the word “about”. Practice within the numerical limitsstated is generally preferred. Also, unless expressly stated to thecontrary, the description of a group or class of materials by suitableor preferred for a given purpose in connection with the disclosureimplies that mixtures of any two or more members of the group or classmay be equally suitable or preferred.

According to embodiments of the present disclosure, a heat-sealablethermoprintable tape is disclosed. The heat-sealable thermoprintabletape can be used for labelling for clothing, industrial garments, suchas uniforms, gear, shoes, etc, as shown in an exemplary embodiment inFIG. 1A as a label on scrubs. As such, a smooth and durable printingsurface is provided by extrusion to print readable identifiers, such asbar codes, on the tape ribbon, as shown in FIGS. 1B-C, without the needfor additional processing. Furthermore, the heat-sealablethermoprintable tape adheres to various types of fabric, providingversatility in design, as well as remains adhered to the fabric withoutcurling due to heat, and remains flexible through multiple use-cycles(e.g., washing and drying), as compared to sewn on labels.

The heat-sealable thermoprintable tape of the present disclosureincludes a solid extruded film as a base coating. Although otherextruded thermoplastic coatings are contemplated (e.g., cross-linkedaliphatics, such as polycarbonate) by the present disclosure, apolyurethane film is described hereinafter as an example, and is notintended to be limiting. For garment washing, polyurethanes providesuperior resistance to detergent and soaps when compared to otherthermoplastic polymers, which may curl or degrade. The extruded film issolidified upon cooling, and a second heat-sealable film may then beextruded on the back side of the extruded polyurethane film, as shown inFIG. 2B. The polyurethane film and heat-sealable film may be extruded onto either side of a support layer, such as, for example, a scrim, as inFIG. 2A, or directly bonded during extrusion to each other, as shown inFIG. 2B. The support layer may be used in removal of the labels, butalso provides structure to the labels prior to adhering to fabricuniforms.

In certain embodiments, the support layer has an open structure and iscapable of supporting the film layers in the open structure such thatthey bond together during extrusion. The open structure allows the filmsto bond to create a composite tape, while extrusion provides a smoothsurface for printing without calendaring or additional surfaceprocessing. The extruded layers, as compared to solution-basedthermoprintable tapes, relatively lack contours of the open structure,thus providing a smooth printing surface. Smoothness of the surface maybe measured by a Sheffield or Gurley test to determine if the surface issufficiently smooth for printing. For printing of readable print, thedots forming the pattern should appear continuous, as shown in FIGS.1B-C. Discontinuities in the surface can cause the pattern to appearbroken, and thus unreadable in the exemplary embodiment of bar codes.Conventional heat-sealable thermoprintable tapes require calendaring tosmooth peaks and valleys in the surface, which does not always make thesurface printable. Thus, extruded layers provide a smooth printingsurface such that the pattern of dots appears continuous, without theneed for additional surface treatment.

The base coating of polyurethane may be coated with an aliphaticpolyurethane top coat, such as a polycarbonate, to protect the tape fromUV exposure and yellowing. Furthermore, a polycarbonate basedpolyurethane/urea aliphatic top coat provides further resistance tohydrolytic degradation. The coatings may be applied by a reverse rolloperation, which allows for weight and thickness control for thecoatings, thus providing a relatively smooth coating when compared toconventional coating methods.

Referring to FIG. 2A, a schematic cross-section of a heat-sealablethermoprintable tape 100, or tape 100, is shown according to anembodiment. In at least one embodiment, tape 100 a includes a supportlayer 110 having an open structure. The support layer is a middlestructural layer such as a scrim, a permeable sheet, a spun fabric, andthe like. While certain embodiments are contemplated, it should beunderstood that the support layer is any layer capable of supportingcoating layers in an open structure. In certain embodiments, the supportlayer 110 is a woven layer having an open weave. An open structure in asupport layer is able to support an extruded coating, unlike tight knitlayers required to support solvent based coatings. With an openstructure in the support layer, unlike solvent based coatings whichwould fall through, the extruded coatings push into the voids of theopen structure. Although ‘scrim’ is used hereinafter, it should beunderstood that in other embodiments, any support layer with an openstructure may be contemplated by the present disclosure, and a scrim isa representative example of a support layer.

Tape 100 a includes a thermoplastic coating 120 extruded onto the scrim110. The open structure of support layer or scrim 110 allows thethermoplastic coating to push into and through the scrim duringextrusion without falling through the scrim 110, and provides a smoothsurface (e.g., without the weave contours) for printing upon cooling,without the use of solvents. Although coating 120 is hereinafterreferred to as polyurethane coating 120, it is contemplated that anythermoplastic extrudable coating may be used to form the heat-sealablethermoprintable tape (e.g., a cross-linked aliphatic), and that certainproperties (i.e., weight) may vary for different thermoplastic coatings.The thermoplastic coating 120 has a relatively strong resistance todetergent and soap. The polyurethane coating 120 (or first polyurethanecoating) may be a thermoplastic polyurethane (TPU) coating, such ascommercially available K-126 polyurethane, or other TPU with a similarsoftening point and mechanical properties. The TPU may be an aromaticTPU, produced by polymerization of a polyol with an aromaticdiisocyanate, e.g. diphenyl methane diisocyanate. The Shore Hardness(Shore A) (ASTM D2240) of the polyurethane coating 120, in at least oneembodiment, is 45 to 98 A, in another embodiment is 50 to 96 A, and inyet another embodiment, is 55 to 95 A. In one or more embodiments, theextruded polyurethane coating 120 has a thickness of 1 to 5 mm, inanother embodiment, of 2 to 4 mm, and in yet another embodiment, of 3mm. In at least one embodiment, the extruded polyurethane coating 120 ofthe tape has a weight of 100 to 180 g/m². In an embodiment, the extrudedpolyurethane coating has a weight of 110 to 160 g/m², and in anotherembodiment, of 120 to 150 g/m². In yet another embodiment, the extrudedpolyurethane coating has a weight of 130 g/m². The extruded polyurethanecoating provides a fast and durable heat-sealed bond with a smoothsurface for uses such as, but not limited to, uniform labels and barcodes.

Further, in at least one embodiment, tape 100 a includes a heat-sealpolymer 130 extruded onto the other side of the support layer 110,opposite from the first polyurethane coating 120. In other embodiments,as shown in FIG. 2B, the tape 100 b includes a heat-seal polymerextruded directly onto the extruded polyurethane coating 120. Theheat-seal polymer 130 may be a polyurethane, such as a thermoplasticpolyurethane, or other suitable polyurethane. The heat-seal polymer hasa chemical structure that is able to flow into the garment/uniform beinglabelled, and form a bond with the fibers. In at least one embodiment,the heat-seal polymer 130 may be the same polyurethane as thepolyurethane coating 120. For example, both the heat-seal polymer 130and the extruded polyurethane coating 120 may be a TPU such as, e.g.,commercially available K126.

Heat-seal polymer 130 may interchangeably be referred to as the secondpolyurethane coating. In some embodiments, the heat-seal polymer 130 mayhave similar properties to the extruded polyurethane coating 120, suchas, but not limited to, urethane level, degree of crystallization,hardness, softening point, and others. In other embodiments, theheat-seal polymer 130 may have different properties than the extrudedpolyurethane coating 120 such that, for example, the flow of theheat-seal polymer 130 is different from the extruded polyurethanecoating 120, the extruded polyurethane coating 120 may be harder thanthe heat-seal polymer 130, or the heat-seal polymer 130 may be morecrystalline than the extruded polyurethane coating 120.

In certain embodiments, as shown in FIG. 2A, heat-seal polymer 130 alsopushes into the open structure of scrim 110, and a durable bond formsbetween the first polyurethane coating 120 and the second polyurethanecoating 130 within the open weave of support layer 110. In otherembodiments, as in the embodiment of tape 100 b shown in FIG. 2B, thesecond polyurethane coating 130 bonds directly to the first polyurethanecoating 120 without a support layer. In one or more embodiments, theheat-seal polymer 130 has a thickness of 1 to 5 mm, in anotherembodiment of 2 to 4 mm, and in yet another embodiment, of 3 mm. In atleast one embodiment, the heat-seal polymer has a weight of 50 to 150g/m². In an embodiment, the heat-seal polymer has a weight of 75 to 125g/m², and in another embodiment, a weight of 90 to 110 g/m². In yetanother embodiment, the heat-seal polymer has a weight of 100 g/m². Thecoating weight of the heat-seal polymer 130 and the shore and/ordurometer of urethane provides thermoprintable and smoothness propertiesto the tape 100 a when used in offset printing or inkjet printing, evenwhen used without a top-coat. In some embodiments, the heat-seal polymer130 may further include a wax component with the polyurethane prior toextrusion. The wax component lubricates the heat-seal polymer 130 duringthe extrusion process. Either the first polyurethane coating 120 orheat-seal polymer 130, or both, may include other additives including,but not limited to, flame retardants, titanium dioxide, silica, or otheradditives.

Referring again to FIGS. 2A and 2B, the tape 100 a, 100 b in certainembodiments further includes a top coat 140 having aliphatic propertieson top of the polyurethane coating 120. In some embodiments, the topcoat 140 provides UV resistance such that it prevents the tape fromyellowing due to water sublimation or from exposure to UV rays, as wellas resistance to hydrolysis during multiple washes. The top coat 140 maybe, for example, an aromatic polycarbonate, a white aliphaticpolycarbonate, an aliphatic polyurea, an aliphatic polyurethane, analiphatic polyester, an aliphatic polyether, or blends thereof. Incertain embodiments, the top coat 140 may be a solvent coating. As anon-limiting example, when the top coat 140 is a white polycarbonate topcoat, the top coat 140 proves UV resistance as well as hydrolyticstability to the tape 100. In at least one embodiment, top coat 140 hasa weight of 10 to 30 g/m². In other embodiments, the top coat 140 has aweight of 15 to 20 g/m², and yet another embodiment, 17 g/m². Thethickness of the top coat 140 may be, in at least one embodiment, 0.25to 3 mm, in another embodiment, 0.5 to 2.5 mm, and in yet anotherembodiment 1 to 2 mm.

The top coat 140 is generally referred to hereinafter as an aliphaticpolycarbonate. The top coat 140 may be applied to the polyurethanecoating 120 by a gravure coater or via a reverse roll application. Whenapplied via a reverse roll application, the top coat 140 is smooth andthe thickness and weight of the coating can be better controlled whencompared with other application processes. As such, the reverse rollprinting can provide a uniform and defect free surface for printing. Thetop coat 140 is applied, in at least one embodiment, at 20 to 40 g/m²,in some embodiments, is applied at 25 to 35 g/m², and in yet otherembodiments, is applied at 27 to 33 g/m². Top coat 140 may be solventbased or aromatic, creating a bond with the polyurethane coating 120 asit is applied as a wet solvent or paint lacquer. In some embodiments,the polyurethane coating 120 and/or the top coat 140 may includecross-linkers to chemically bond the polyurethane coating 120 and thetop coat 140. When the top coat 140 is a solvent based coating, the tape100 a may be dried after application to evaporate solvents and leavebehind a durable, printable, and cured polycarbonate surface on theextruded film. Because of the open structure, the polyurethane coating120 is able to push into the support layer 110 without falling throughand bond to the heat-seal polymer, and the extrusion of the polyurethanecoating provides a smooth printing surface, void of any of the supportlayer contours, which can then be coated with the top coat 140 to form aprintable surface with improved ink adhesion. The extruded surface isprintable without the need for calendaring or other surface processing.

The smoothness of the surface of the heat sealable-thermoprintable tapeis measured using a measure of surface roughness (ASME B46.1) by aprofilometer (or Sheffield Instrument). As the printable surface of thetape is smoother than conventional tapes, the surface roughness of thetape is lower than that of conventional tapes. In one or moreembodiments, the surface roughness (R_(a)) of the heat-sealablethermoprintable tape is at most 50 μin. In another embodiment, thesurface roughness (R_(a)) of the surface of the heat-sealablethermoprintable tape is 10 to 50 μin, and in yet another embodiment, thesurface roughness is 10 to 40 μin.

In one or more embodiments, the heat sealable thermoprintable tape has apull strength of 30 to 50 lbs/in² as measured by a pull test (ASTMD1876). In an embodiment, the pull strength of the thermoprintable tapeis 35 to 45 lbs/in², and in another embodiment, is 37 to 42 lbs/in². Inyet another embodiment, the pull test strength of the heat-sealablethermoprintable tape of 40 lbs/in². The pull test shows how well thetape adheres to a garment after being applied via heat application,illustrating the bond between the polyurethane coating/heat-seal polymerand the garment fibers. Because the scrim is coated with urethane onboth sides, the pull adhesion is greatly improved compared toconventional heat sealable thermoprintable tapes (having a pull test of7 lbs/in²) because the polyester scrim is coated all the way around andthrough the polyester scrim.

According to at least one embodiment, the tape has a total weight of 200to 300 g/m². In some embodiments the tape has a total weight of 215 to285 g/m², and in other embodiments, has a total weight of 225 to 275g/m². In yet another embodiment, the tape has a total weight of 240 to265 g/m². In an embodiment, the tape has a total weight of 260 g/m².With respect to the thickness of the tape, the total thickness of thetape in at least one embodiment is 3 to 12 mm. In other embodiments, thethickness of the tape is 5 to 10 mm, and in yet another embodiment 8 mm.

Referring again to FIG. 2A, in certain embodiments, the support layer110 may be a scrim. The scrim having an open structure includes a highervoid content than tight knit conventional scrims. In at least oneembodiment, the scrim 110 may be a polyester scrim, a nylon scrim, acotton scrim, or a blend thereof. Scrim 110 may be 50% to 100%polyester. In some embodiments, the scrim 110 is 80% to 100% polyester.The woven scrim 110 is not sensitive to heat, does not have propensityto curl during washes, and securely adheres to fabric, when compared toconventional fabric scrims for heat-sealable tapes (such as nylon, whichis sensitive to moisture and only adheres to other nylon articles). Thevoids of the open structure of scrim 110 may be formed by the threadcount of the scrim. In certain embodiments, the thread count is 75 to200 for a scrim having a construction with 64 ends, and in otherembodiments the thread count is 150 to 200 for a scrim having 54 ends.The strands of the scrim 110 have a linear mass density of fibers of60×60 to 80×80 denier. For example, in some embodiments, the scrim 110has a linear mass density of fibers of 68×68 to 72×72 denier. In yetanother embodiment, the scrim 110 has a linear mass density of fibers of70×70 denier. Further, the scrim 110 has a thickness of 1 to 5 mm. Insome embodiments, the scrim 110 has a thickness of 3 mm. The scrim has across weave of 120 to 160. In some embodiments, the scrim has a crossweave of 140. The scrim 110 shows 1 to 3 oz/yd². In some embodiments,the scrim 110 shows 1.25 oz/yd² to 2.55 oz/yd². In yet anotherembodiment, the scrim 110 shows 1.45 oz/yd². In at least one embodiment,the weight of scrim 110 is 20 to 70 gsm, and in some embodiments, is 25to 55 gsm. In yet another embodiment, the weight of scrim 110 is 30 gsm.Scrim 110 includes individual threads or strands wound 15 to 25 timesper lineal inch, and in some embodiments, 18 to 20 times per linealinch, to provide stiffness at the nip point during extrusion out of ahot die at about 400° F. Furthermore, in at least one embodiment, scrim110 has a void content of 10% to 50% by volume. In some embodiments, thescrim 110 has a void content of 12% to 40% by volume. In yet anotherembodiment, the scrim 110 has a void content of 15 to 30% by volume.

According to one or more embodiments, an exemplary method of forming aheat-sealable thermoprintable tape is disclosed. Referring to FIG. 3,the method 200 includes, at step 210, providing a support layer, e.g. anopen weave scrim. According to an embodiment, the scrim has a density of68 to 72 denier and a thickness of 3 mm. The woven scrim has an openstructure configured to support an extruded coating. Next, at step 220,a polyurethane coating is extruded onto a first side of the scrim andinto the open weave to form a top surface which is smooth for printing.Due to the open weave nature of the scrim, the polyurethane is able topush into the scrim during extrusion, thus forming a smooth top surface.Further, at step 230, a heat-sealable polymer (or second polyurethanecoating) is extruded onto a second side of the scrim opposite the firstside and into the open weave such that the polyurethane coating bonds tothe heat-sealable polymer within the open weave of the scrim. Theheat-sealable polymer pushes into the open weave of the scrim to formthe bond with the polyurethane coating within the scrim from theopposite side. At step 240, an aliphatic top coat, such as apolycarbonate, is applied to the top surface, to provide a smoothprintable surface with UV resistance. The aliphatic top coat can beapplied via a reverse roll process or a gravure coater.

Referring to FIG. 4, a method of forming a heat-sealable thermoprintabletape is disclosed according to yet another embodiment. The method 300includes, at step 310, providing a support layer, e.g. an open weavescrim. According to another embodiment, the scrim has a density of 68 to72 denier and a thickness of 3 mm. The woven scrim has an open weaveconfigured to support an extruded coating. At step 310, a wax componentis added to a polyurethane coating to lubricate the polyurethane duringthe extrusion process. Next, at step 320, the polyurethane coating isextruded onto a first side of the scrim and into the open weave to forma top surface which is smooth for printing. Due to the open weave natureof the scrim, the polyurethane is able to push into the scrim duringextrusion, thus forming a smooth top surface. Further, at step 330, aheat-sealable polymer (or second polyurethane coating) is extruded ontoa second side of the scrim opposite the first side and into the openweave such that the polyurethane coating bonds to the heat-sealablepolymer within the open weave of the scrim. The heat-sealable polymerpushes into the open weave of the scrim to form the bond with thepolyurethane coating within the scrim from the opposite side. At step340, an aliphatic top coat, such as a polycarbonate, is applied to thetop surface, to provide a smooth printable surface with UV resistance.The aliphatic top coat can be applied via a reverse roll process or agravure coater.

Although in FIGS. 3 and 4, the methods are shown as extruding onto thesupport layer, it is contemplated that the layers may be extruded ontoeach other directly, as in the embodiment of FIG. 2B, such that thecoatings bond directly with each other, as opposed to within the supportlayer. According to an embodiment, the first thermoplastic layer isextruded, and subsequently the heat-seal polymer is extruded onto thethermoplastic layer, or vice versa. The thermoplastic layer thus has asmooth printing surface, that can further be coated with an aliphaticpolycarbonate top coat.

In an embodiment, the TPU coatings may be dissolved in solvents. Forexample, aromatic TPU coatings are typically soluble in solvents suchas, but not limited to, blends of methyl-ethyl ketone and toluene. Thealiphatic polycarbonate top coat is typically soluble in solvents suchas, but not limited to, blends of isopropanol and toluene. When thecoatings are dissolved in solvents, the coating operation may beperformed in a reverse roll printing operation. Reverse roll printingyields a tape with desirable weight characteristics because ofcontrolled coating thickness and improved smoothness of the printablesurface. In embodiments where the TPU coatings are dissolved insolvents, the scrim may include a tighter weave fabric construction. Asin the embodiment of FIG. 2, the scrim is coated with the aromatic TPUheat-seal polymer in solution, such that the surface of the scrim issealed, and the opposite surface of the scrim is coated with thepolyurethane coating (or base-coat TPU) in solution. The aliphatic topcoat, such as a polycarbonate, is then applied to the base coat TPU. Ina refinement, the heat-seal polymer is first extruded onto the scrim,and then the coated scrim is sent to the reverse roll printer forapplying the base coat TPU and top coat polycarbonate.

Referring to FIGS. 5A-C, a process diagram and components for forming aheat-sealable thermoprintable tape is shown according to anotherembodiment. In FIG. 4A, a release paper 405 (or releasable paper), withan aromatic thermoplastic urethane coating 415 extruded onto the releasepaper 405, is provided exiting tunnel 406 as part of a first operation400. The aromatic thermoplastic urethane (TPU) coating is apolycarbonate TPU. A polyurethane coating 420 is also extruded on tocoating 415 at, to form the composite 440, as shown in FIG. 4C. Thepolyurethane coating may be a base coating such as a TPU coating, suchas commercially available K-126 polyurethane. The TPU may be an aromaticTPU. Although in FIG. 4C, two polycarbonate white coat layers are shown,415, 416, there may be only one or any number of polycarbonate coatingsbased on the desired thickness and linkage. Composite 440 is provided toa nip-roll operation 460. In a separate operation 401, a heat sealpolymer 430 is extruded onto one side of a support layer 410 to formanother composite 450. The composite 450 of the support layer 410 andheat-seal polymer 430 is shown in FIG. 4B. The heat-seal polymer 430 maybe a polyurethane, such as a thermoplastic polyurethane. In a thirdoperation 402, the composite 450 is passed through a heated nip roller460, such that the scrim composite 450 and the coated release paper 440are joined by heat and pressure at the nip point to form thermoprintabletape 470. Through the heated nip roller 460, the polyurethane coating420 from the first operation 400 is pushed into the other side of thescrim 410 from the heat-seal polymer 430, such that the polyurethanecoating 420 and the heat-seal polymer 430 form a durable bond within thesupport layer 410. The thermoprintable tape 470 may be separated fromthe release paper 405 after the nip rolling process. Although therelease paper 405 is shown in FIG. 4A as being removed from the tape 470after nip-rolling, the release paper may be removed later in theprocess, or left on the tape for removal after the point of sale.

According to embodiments of the present disclosure, a heat-sealablethermoprintable tape is disclosed. The heat-sealable thermoprintabletape includes a solid thermoplastic film extruded on a support layersuch that a heat-sealable film extruded on the opposite side of thescrim can bond with the thermoplastic film within the support layer. Inanother embodiment, the solid thermoplastic film and heat-sealable filmare extruded directly onto each other, such that they are directlybonded without the need of a support layer. The open structure of thesupport layer allows the films to push into the scrim during extrusion,resulting in a strong bond between the coatings. In one or moreembodiments, the thermoplastic film, the heat-sealable film, or both,are a polyurethane material. The extrusion provides a smooth surface forprinting without the need of calendaring or additional processing tosmoothen the surface. The thermoplastic coating may further be coatedwith a polycarbonate top coat to provide aliphatic properties to preventthe tape from yellowing.

While exemplary embodiments are described above, it is not intended thatthese embodiments describe all possible forms of the invention. Rather,the words used in the specification are words of description rather thanlimitation, and it is understood that various changes may be madewithout departing from the spirit and scope of the invention.Additionally, the features of various implementing embodiments may becombined to form further embodiments of the invention.

What is claimed is:
 1. A heat-sealable thermoprintable tape comprising:an extruded thermoplastic coating having a smooth printable surface on afirst side; and an extruded heat-seal polymer layer disposed on a secondside of the extruded thermoplastic coating, opposite the first side,wherein the extruded thermoplastic coating is bonded to the heat-sealpolymer layer to form the heat-sealable thermoprintable tape.
 2. Theheat-sealable thermoprintable tape of claim 1, wherein the smoothprintable surface has a surface roughness of at most 50 μin as measuredby a profilometer.
 3. The heat-sealable thermoprintable tape of claim 1,wherein the smooth printable surface has a surface roughness of 10 to 40μin as measured by a profilometer.
 4. The heat-sealable thermoprintabletape of claim 1, wherein the extruded thermoplastic coating has a ShoreHardness of 45 to 98 A.
 5. The heat-sealable thermoprintable tape ofclaim 1, further comprising a support layer between the extrudedthermoplastic coating and the extruded heat-seal polymer layer, thesupport layer having an open structure, wherein the extrudedthermoplastic coating and heat-seal polymer are bonded within the openstructure of the support layer.
 6. The heat-sealable thermoprintabletape of claim 5, wherein the support layer is a scrim, a permeablesheet, a spun fabric, or a woven layer.
 7. The heat-sealablethermoprintable tape of claim 6, wherein the support layer is a scrimhaving a thread count of 150 to
 200. 8. The heat-sealablethermoprintable tape of claim 7, wherein the scrim is a polyester scrim.9. The heat-sealable thermoprintable tape of claim 1, wherein theextruded thermoplastic coating is 1 to 5 mm thick, and the heat-sealpolymer layer is 1 to 5 mm thick.
 10. The heat-sealable thermoprintabletape of claim 1, wherein the extruded thermoplastic coating is athermoplastic polyurethane coating.
 11. The heat-sealablethermoprintable tape of claim 10, wherein the extruded thermoplasticcoating and the extruded heat-seal polymer are the same polyurethanematerial.
 12. The heat-sealable thermoprintable tape of claim 1, furthercomprising an aliphatic polycarbonate polyurethane top coat layerdisposed on the first side of the extruded thermoplastic coating.
 13. Amethod of forming a heat-sealable thermoprintable tape, comprising:providing a support layer having an open structure configured to supportan extruded coating; applying a polyurethane coating onto a first sideof the support layer and into open spaces of the open structure to forma top surface; and extruding a heat-sealable polymer onto a second sideof the support layer opposite the first side and into the open spaces ofthe open structure such that the polyurethane coating bonds to theheat-sealable polymer within the open structure of the support layer.14. The method of claim 13, wherein the top surface has a surfaceroughness of at most 50 μin as measured by a profilometer.
 15. Themethod of claim 13, wherein applying the polyurethane coating includesreverse-roll printing the polyurethane coating.
 16. The method of claim13, wherein the open structure of the support layer is defined by a voidcontent of 10 to 50% by volume.
 17. The method of claim 13, furthercomprising applying an aliphatic polycarbonate coating to the topsurface of the polyurethane coating by reverse-rolling to form aprintable surface.
 18. A method of forming a heat-sealablethermoprintable tape comprising: applying a heat-sealable polymer on toa support layer to form a first composite; applying an aliphaticpolycarbonate polyurethane coating to a releasable paper; applying apolyurethane coating on to the aliphatic polycarbonate polyurethanecoating on the releasable paper to form a second composite; and bondingthe heat-sealable polymer of the first composite to the polyurethanecoating of the second composite within the support layer with heat andpressure to form the heat-sealable thermoprintable tape having aprintable surface on the aliphatic polycarbonate polyurethane coating.19. The method of claim 18, wherein applying the aliphatic polycarbonatepolyurethane coating to the releasable paper includes reverse-rollprinting the aliphatic polycarbonate polyurethane coating.
 20. Themethod of claim 18, wherein applying a heat-sealable polymer includesreverse-roll printing the heat-sealable polymer to form the firstcomposite, and applying the polyurethane coating to the aliphaticpolycarbonate polyurethane coating includes reverse-roll printing toform the second composite.
 21. The method of claim 18, wherein theprintable surface has a surface roughness of at most 50 μin.
 22. Themethod of claim 18, wherein the support layer has an open structuredefined by a void content of 10 to 50% by volume.
 23. A heat-sealablethermoprintable tape comprising: a support layer having an openstructure configured to support an extruded coating; an extrudedthermoplastic coating disposed on a first side of the support layer andin the open structure, the extruded thermoplastic coating having asmooth printable surface; and an extruded heat-seal polymer layerdisposed on a second side of the support layer, opposite the first side,and in the open structure, wherein the extruded thermoplastic coating isbonded to the heat-seal polymer layer within the open structure of thesupport layer to form the heat-sealable thermoprintable tape.
 24. Theheat-sealable thermoprintable tape of claim 23, wherein the openstructure of the support layer is defined by a void content of 10 to 50%by volume.
 25. The heat-sealable thermoprintable tape of claim 23,wherein the extruded thermoplastic coating and the extruded heat-sealpolymer layer are the same polyurethane material.